结构用冷弯空心型钢（GB/T6728—1986）
(1)尺寸规格见表1--表3
A一边长 t一壁厚 R一外圆弧半径
表1 方形空心钢的尺寸规格
|
边长/mm |
尺寸允许偏差/mm |
壁厚t/mm |
理论
质量
/(kg/m) |
截面
面积
/cm2
|
边长
/mm |
尺寸允许偏差 |
壁厚
t/mm |
理论
质量
/(kg/m) |
截面
面积/cm2 |
|
A |
普通
精度 |
较高
精度 |
A |
普通
精度 |
较高
精度 |
|
25 |
±0.60 |
±0.30 |
1.2 |
0.867 |
1.105 |
80 |
±1.40 |
±0.70 |
3.0 |
7.071 |
9.008 |
|
1.5 |
1.06l |
1.352 |
4.0 |
9.222 |
11.747 |
|
1.75 |
1.215 |
1.548 |
5.0 |
11.209 |
14.356 |
|
2.0 |
1.363 |
1.736 |
90 |
±1.50 |
±0.75 |
3.0 |
8.013 |
10.208 |
|
30 |
2.5 |
2.032 |
2.589 |
4.0 |
l0.478 |
13.347 |
|
3.0 |
2.361 |
3.008 |
5.0 |
12.839 |
16.356 |
|
40 |
±0.80 |
±0.40 |
2.5 |
2.817 |
3.589 |
6.0 |
15.097 |
19.232 |
|
3.0 |
3.303 |
4.208 |
100 |
±1.60 |
±0.80 |
4.0 |
11.734 |
14.947 |
|
5.0 |
14.409 |
18.356 |
|
4.0 |
4.198 |
5.347 |
6.0 |
16.98l |
21.632 |
|
50 |
±1.00 |
±0.50 |
2.5 |
3.602 |
4.589 |
120 |
±1.80 |
±0.90 |
4.0 |
14.246 |
18.147 |
|
3.0 |
4.245 |
5.408 |
5.0 |
17.549 |
22.356 |
|
6.0 |
20.749 |
26.432 |
|
4.0 |
5.454 |
6.947 |
8.0 |
26.840 |
34.19l |
|
60 |
±1.20 |
±0.60 |
2.5 |
4.387 |
5.589 |
140 |
±2.00 |
±1.00 |
4.0 |
16.758 |
21.347 |
|
3.0 |
5.187 |
6.608 |
5.0 |
20.689 |
26.356 |
|
4.0 |
6.7l0 |
8.547 |
6.0 |
24.517 |
31.232 |
|
8.0 |
31.864 |
40.59l |
|
5.0 |
8.129 |
10.356 |
160 |
±2.40 |
±1.20 |
4.0 |
19.270 |
24.547 |
|
70 |
3.0 |
6.129 |
7.808 |
5.0 |
23.829 |
30.356 |
|
4.0 |
7.966 |
10.147 |
6.0 |
28.285 |
36.032 |
|
5.0 |
9.699 |
12.356 |
8.0 |
36.888 |
46.99l |
A一长边 B一短边 t一壁厚 R一外圆弧半径
表2 矩形空心钢的尺寸规格
|
边长(mm) |
尺寸允许偏差(mm) |
壁厚
(t／mm) |
理论质量
(kg／m) |
截面面积
(cm2) |
|
|
A |
B |
普通精度 |
较高精度 |
|
|
|
|
50 |
25 |
±1.00 |
±0.50 |
1.2 |
1.338 |
1.705 |
|
1.5 |
1.650 |
2.102 |
|
30 |
2.5 |
2.817 |
3.589 |
|
3.0 |
3.303 |
4.208 |
|
4.0 |
4.198 |
5.347 |
|
60 |
±1.20 |
±0.60 |
2.5 |
3.209 |
4.089 |
|
3.0 |
3.774 |
4.808 |
|
4.0 |
4.826 |
6.147 |
|
40 |
2.5 |
3.602 |
4.589 |
|
3.0 |
4.245 |
5.408 |
|
4.0 |
5.454 |
6.947 |
|
70 |
50 |
3.0 |
5.187 |
6.608 |
|
4.0 |
6.710 |
8.547 |
|
5.0 |
8.129 |
10.356 |
|
80 |
40 |
±1.40 |
±0.70 |
2.5 |
4.387 |
5.589 |
|
3.0 |
5.187 |
6.608 |
|
4.0 |
6.7l0 |
8.547 |
|
5.0 |
8.129 |
10.356 |
|
60 |
3.0 |
6.129 |
7.808 |
|
4.0 |
7.966 |
10.147 |
|
5.0 |
9.699 |
12.356 |
|
90 |
40 |
±1.50 |
±0.75 |
3.0 |
5.658 |
7.208 |
|
4.0 |
7.338 |
9.347 |
|
5.0 |
8.914 |
11.356 |
|
50 |
3.0 |
6.129 |
7.808 |
|
4.0 |
7.966 |
l0.147 |
|
5.0 |
9.699 |
12.356 |
|
60 |
3.0 |
6.600 |
8.408 |
|
4.0 |
8.594 |
l0.947 |
|
5.0 |
10.484 |
13.356 |
|
100 |
50 |
±1.60 |
±0.80 |
3.0 |
6.600 |
8.408 |
|
4.0 |
8.594 |
10.947 |
|
5.0 |
10.484 |
13.356 |
|
120 |
60 |
±1.80 |
±0.90 |
3.0 |
8.013 |
10.208 |
|
4.0 |
10.478 |
13.347 |
|
5.0 |
12.839 |
16.356 |
|
6.0 |
15.097 |
19.232 |
|
80 |
3.0 |
8.955 |
11.408 |
|
4.0 |
11.734 |
14.947 |
|
5.0 |
14.409 |
18.356 |
|
6.0 |
16.981 |
21.632 |
|
140 |
±2.00 |
±1.00 |
4.0 |
12.990 |
16.547 |
|
5.0 |
15.979 |
20.356 |
|
6.0 |
18.865 |
24.032 |
|
150 |
100 |
±2.40 |
±1.20 |
4.0 |
14.874 |
18.947 |
|
5.0 |
18.334 |
23.356 |
|
6.0 |
21.691 |
27.632 |
|
8.0 |
28.096 |
35.791 |
|
160 |
80 |
4.0 |
14.246 |
18.147 |
|
5.0 |
17.549 |
22.356 |
|
6.0 |
20.749 |
26.432 |
|
8.0 |
26.840 |
34.19l |
|
180 |
100 |
±2.60 |
±1.30 |
4.0 |
16.758 |
21.347 |
|
5.0 |
20.689 |
26.356 |
|
6.0 |
24.517 |
31.232 |
|
8.0 |
31.864 |
40.591 |
|
200 |
4.0 |
18.014 |
22.947 |
|
5.0 |
22.259 |
28.356 |
|
6.0 |
26.401 |
33.632 |
|
8.0 |
34.376 |
63.79l |
|
|
|
|
|
|
|
|
|
|
|
注：表中理论质量按密度为7.85g/cm3计算。
表3 型钢弯曲角的外圆弧半径
|
选用钢种 |
外圆弧半径／mm |
|
t≤4 |
4<T≤8< DIV> |
|
普通碳素结构钢 |
≤2.5t |
≤3.0t |
|
低合金结构钢 |
≤3.Ot |
供需双方协议 |
注：型钢弯曲角度的允许偏差不得大于±1.6°。
(2)允许偏差
表4 型钢的长度允许偏差 (mm)
|
定尺精度 |
长 度 |
允许偏差 |
|
普通定尺 |
4000～9000 |
+100
0 |
|
精确定尺 |
4000～6000 |
+5
0 |
|
>6000～9000 |
+l0
0 |
注：1.型钢允许交付长度不小于2m的短尺，但其质量不得大于该批交货质量的5%。
2.型钢壁厚等于或大于2.5mm时，弯曲度每米不得大于2.5mm，总弯曲度不得大于总长度的O.2％。
当型钢壁厚小于2mm时，弯曲度每米不得大于3mm， 总弯曲度不得大于总长度的O.30％。
3.型钢不得有明显扭转。型钢的端部应切得正直，由切断方法造成的较小变形和毛刺允许存在。
(3)用途用于建筑和机械制造结构。
理论重量表
钢材理论重量表
钢材理论重量表 ( 管类：公斤/米 板类：公斤/平方米)
|
热 板 |
花纹板 |
方 钢 |
工字钢 |
镀锌扁钢 |
电线管 |
镀锌角钢 |
|
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
|
0.5 |
3.925 |
2.5 |
22.6 |
10*10 |
0.785 |
10# |
11.261 |
25*4 |
0.827 |
15 |
0.625 |
40*4 |
2.567 |
|
0.75 |
5.888 |
3 |
26.6 |
12*12 |
1.13 |
12# |
13.98 |
30*3 |
0.753 |
20 |
0.766 |
50*5 |
3.996 |
|
0.8 |
6.28 |
3.5 |
30.5 |
14*14 |
1.54 |
14# |
16.89 |
40*4 |
1.325 |
25 |
1.048 |
|
|
|
1 |
7.85 |
4 |
34.4 |
16*16 |
2.01 |
16# |
20.516 |
|
|
32 |
1.329 |
|
|
|
1.2 |
9.42 |
4.5 |
38.3 |
18*18 |
2.54 |
18# |
24.143 |
|
|
40 |
1.611 |
|
|
|
1.5 |
11.78 |
5 |
42.3 |
20*20 |
3.14 |
20b# |
31.069 |
|
|
50 |
2.407 |
|
|
|
2 |
15.7 |
6 |
50.1 |
25*25 |
4.91 |
22b# |
36.524 |
|
|
|
|
|
|
|
2.5 |
19.63 |
8 |
65.8 |
30*30 |
7.06 |
25b# |
42.03 |
|
|
|
|
|
|
|
3 |
23.55 |
|
|
|
|
28b# |
47.888 |
|
|
|
|
|
|
|
4 |
31.4 |
|
|
|
|
30b# |
48.084 |
|
|
|
|
|
|
|
5 |
39.25 |
|
|
|
|
|
|
|
|
|
|
|
|
|
6 |
47.1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
8 |
62.8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
10 |
78.5 |
|
|
|
|
|
|
|
|
|
|
|
|
|
12 |
94.2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
14 |
109.9 |
|
|
|
|
|
|
|
|
|
|
|
|
|
圆钢 螺纹钢 |
槽 钢 |
焊 管 |
镀锌管 |
角 钢 |
扁 钢 |
|
|
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
规格 |
理重 |
|
6.5 |
0.26 |
5# |
5.438 |
15 |
1.26 |
15 |
1.33 |
25*25*3 |
1.124 |
3*16 |
0.38 |
25*2.5 |
1.39 |
|
8 |
0.395 |
6.5# |
6.709 |
20 |
1.63 |
20 |
1.73 |
30*30*3 |
1.373 |
4*16 |
0.50 |
32*3 |
2.15 |
|
10 |
0.617 |
8# |
8.045 |
25 |
2.42 |
25 |
2.57 |
40*40*4 |
2.422 |
3*20 |
0.47 |
38*3 |
2.59 |
|
12 |
0.888 |
10# |
10.007 |
32 |
3.13 |
32 |
3.32 |
50*50*5 |
3.77 |
4*20 |
0.63 |
45*4 |
4.04 |
|
14 |
1.21 |
12# |
12.059 |
40 |
3.84 |
40 |
4.07 |
63*63*6 |
5.721 |
4*25 |
0.78 |
51*4 |
4.63 |
|
16 |
1.58 |
14a# |
14.535 |
50 |
4.88 |
50 |
5.17 |
70*70*7 |
7.398 |
3*30 |
0.71 |
57*4 |
5.23 |
|
18 |
2 |
14b# |
16.733 |
65 |
6.64 |
65 |
7.04 |
75*75*8 |
9.03 |
4*40 |
1.26 |
76*4.5 |
7.93 |
|
20 |
2.47 |
16a# |
17.24 |
80 |
8.34 |
80 |
8.84 |
75*50*6 |
5.699 |
6*40 |
1.88 |
89*4.5 |
9.38 |
|
22 |
2.98 |
16# |
19.752 |
100 |
10.85 |
100 |
11.5 |
80*80*8 |
9.658 |
5*50 |
1.96 |
108*4.5 |
11.49 |
|
25 |
3.85 |
18a# |
20.174 |
125 |
15.04 |
125 |
15.94 |
90*90*7 |
9.656 |
8*50 |
3.14 |
127*4.5 |
13.59 |
|
28 |
4.83 |
18# |
23 |
150 |
17.81 |
150 |
18.88 |
90*90*9 |
12.717 |
6*60 |
2.83 |
133*5 |
15.78 |
|
32 |
6.31 |
20a# |
22.637 |
200 |
26.388 |
|
|
|
|
8*80 |
5.02 |
159*6 |
22.64 |
|
|
|
20# |
25.777 |
|
|
|
|
|
|
8*100 |
6.28 |
219*7 |
36.6 |
|
|
|
22# |
28.453 |
|
|
|
|
|
|
10*100 |
7.85 |
219*8 |
41.65 |
|
|
|
25b# |
31.335 |
|
|
|
|
|
|
|
|
325*10 |
77.68 |
|
|
|
28# |
35.823 |
|
|
|
|
|
|
|
|
377*12 |
108.02 |
|
|
|
30# |
39.173 |
|
|
|
|
|
|
|
|
|
|
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